Install sddm-theme-debian-maui by entering the following commands in the terminal:
sudo apt update sudo apt install sddm-theme-debian-maui
Description:
'Debian Maui' theme for SDDM X11 display manager
Maui theme for SDDM, using the active desktop-base theme for the background
Homepage: https://github.com/sddm/sddm
Version: 0.17.0-1ubuntu7
Section: universe/kde